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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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package org.apache.james.transport.util;

import javax.mail.MessagingException;

import org.apache.james.transport.mailets.redirect.SpecialAddress;
import org.apache.mailet.Mail;
import org.apache.mailet.MailAddress;

import com.google.common.base.Optional;

public class ReplyToUtils {

    public static ReplyToUtils from(Optional<MailAddress> replyTo) {
        return new ReplyToUtils(replyTo);
    }

    public static ReplyToUtils from(MailAddress replyTo) {
        return new ReplyToUtils(Optional.fromNullable(replyTo));
    }

    private final Optional<MailAddress> replyTo;

    private ReplyToUtils(Optional<MailAddress> replyTo) {
        this.replyTo = replyTo;
    }

    public Optional<MailAddress> getReplyTo(Mail originalMail) throws MessagingException {
        if (replyTo.isPresent()) {
            if (replyTo.get().equals(SpecialAddress.UNALTERED)) {
                return Optional.absent();
            }
            return Optional.fromNullable(originalMail.getSender());
        }
        return Optional.absent();
    }
}
